1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
LUCKY_DIMON [66]
3 years ago
10

The head of institutional research at a university believed that the mean age of full-time students was declining. In 1995,the m

ean age of a full-time student was known to be 27.4 years. After looking at the enrollment records of all 4934 full-time students in the current semester, he found that the mean age was 27.1 years, with a standard deviation of 7.3 years. He conducted a hypothesis of H0: μ = 27.4 years versus H1: μ < 27.4 years and obtained a P-value of 0.0020. He concluded that the mean age of full-time students did decline. Is there anything wrong with his research?A. No, the hypothesis test was conducted correctly, and the correct conclusion was made.B. Yes, a P-value only indicates the likelihood of getting a result as extreme or more extreme as the one found, the head of institutional research needs to include a confidence level.C. Yes, the head of institutional research has access to the entire population, inference is unnecessary. He can say with 100% confidence that the mean age has decreased.D. Yes, the head of institutional research stated the hypotheses incorrectly; a left-tailed hypothesis test was conducted instead of a two-tailed test.
Mathematics
1 answer:
Leno4ka [110]3 years ago
3 0

Answer:

A. No, the hypothesis test was conducted correctly, and the correct conclusion was made.

Step-by-step explanation:

Given that the head of institutional research at a university believed that the mean age of full-time students was declining. In 1995,the mean age of a full-time student was known to be 27.4 years.

For this he has recorded all 4934 students and got average as 27.1 years

This is very much perfect because the question is about the mean age of a full time student.  when all full time students in the university are taken into account and mean arrived this is a reliable procedure.

The hypothesis also is right as this is left tailed test.

Since p =0.002<0.05 he rejected null hypothesis.

Conclusion is the mean age did decline.  Everything is right.

A. No, the hypothesis test was conducted correctly, and the correct conclusion was made.

You might be interested in
Please help 25 points
Romashka-Z-Leto [24]

Answer:

y ≤ -5

Step-by-step explanation:

6 0
3 years ago
Find the value of x?
jekas [21]
Hello!
The left triangle have two same side length so the two bottom angles are the same which is (180-56)/2=62
See the left triangle bottom right angle and the right triangle bigger angle have the sum of 180 degree so the bigger angle=180-62=118
The right triangle also have two same sides so they also have same angle degree so x=(180-118)/2=31
Have a great day!
4 0
3 years ago
adam hikes from bridgetown to lakeville. Gina starts at the same time, and hikes from Lakeville to Bridgetown on the same road.
IgorC [24]

Answer:

45

Step-by-step explanation:

6 0
3 years ago
Find the domain and range of the relation and determine whether it is a function.
Sergio [31]
A is the correct answer. A function is defined where every input, x, has only one output. The coordinates are on the graph are (-4,-1), (-1,4), (1,1), and (4,1). As you can see, there is only one output for every input. X is the domain and y is the range.
3 0
3 years ago
Read 2 more answers
Evaluate 12.7 - x for x= 8.41
agasfer [191]

Answer:

x=  

10

429

​  

 

​  

≈2.071231518

x=−  

10

429

​  

 

​  

≈−2.071231518

Step-by-step explanation:

12.7−xx=8.41

Multiply x and x to get x  

2

.

12.7−x  

2

=8.41

Subtract 12.7 from both sides.

−x  

2

=8.41−12.7

Subtract 12.7 from 8.41 to get −4.29.

−x  

2

=−4.29

Divide both sides by −1.

x  

2

=  

−1

−4.29

​  

 

Expand  

−1

−4.29

​  

≈4.29 by multiplying both numerator and the denominator by 100.

x  

2

=  

−100

−429

​  

 

Fraction  

−100

−429

​  

≈4.29 can be simplified to  

100

429

​  

=4.29 by removing the negative sign from both the numerator and the denominator.

x  

2

=  

100

429

​  

 

Take the square root of both sides of the equation.

x=  

10

429

​  

 

​  

 

x=−  

10

429

​  

 

​  

 

3 0
3 years ago
Read 2 more answers
Other questions:
  • The figure below shows ADC and BEC.Complete the two-column proof.BE AC and AD CBCB ≅ CAProve: ADC ≅ BEC
    15·1 answer
  • Find the product.<br> (6x^2-6x-5) (7x^2+6x-5)
    15·1 answer
  • There are 48 students in a school play. The ratio of boys to girls is 5 : 7. How many more girls than boys are in the play?
    7·2 answers
  • The odds that you will pick a heart from a standard deck of 52 cards is 13:39.<br> True or False?
    9·2 answers
  • What are the values of x and y ?
    5·1 answer
  • Which of the following numbers is irrational? a fraction with numerator negative 15 and denominator 4, a fraction with numerator
    6·2 answers
  • What is the area of the figure?
    15·2 answers
  • Someone please please please help...
    12·2 answers
  • Please solve with explanation I’ve been asking all day (this is not a multiple choice question)
    14·1 answer
  • Someone pls answer thx
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!